I have the exact guitar as well. Although I am not having problems with tuning, I am not a fan of the tuners. I have a couple strats and am fond of the vintage tuners, which I find are much easier to string. I found using some Diaddario nut sauce on the bridge and nut really helps the stability. Theres a Youtube video of how to properly string the guitar as well (not implying that you are doing it wrong, but it does offer some tips). Kluson makes a vintage look tuner, with a locking nut I am considering, but at this point, have not pulled the trigger. I've included the link below. By the way, I love this guitar!
http://www.kluson.com/revolution.htmlI